Optimal stopping under probability distortion
AbstractWe formulate an optimal stopping problem for a geometric Brownian motion where the probability scale is distorted by a general nonlinear function. The problem is inherently time inconsistent due to the Choquet integration involved. We develop a new approach, based on a reformulation of the problem where one optimally chooses the probability distribution or quantile function of the stopped state. An optimal stopping time can then be recovered from the obtained distribution/quantile function, either in a straightforward way for several important cases or in general via the Skorokhod embedding. This approach enables us to solve the problem in a fairly general manner with different shapes of the payoff and probability distortion functions. We also discuss economical interpretations of the results. In particular, we justify several liquidation strategies widely adopted in stock trading, including those of "buy and hold", "cut loss or take profit", "cut loss and let profit run" and "sell on a percentage of historical high".
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Bibliographic InfoPaper provided by arXiv.org in its series Papers with number 1103.1755.
Date of creation: Mar 2011
Date of revision: Feb 2013
Publication status: Published in Annals of Applied Probability 2013, Vol. 23, No. 1, 251-282
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Web page: http://arxiv.org/
This paper has been announced in the following NEP Reports:
- NEP-ALL-2011-03-19 (All new papers)
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- Zuo Quan Xu, 2013. "A Characterization of Comonotonicity and its Application in Quantile Formulation," Papers 1311.6080, arXiv.org.
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